Why did the Rightly Guided Caliphs switch from tamattu ‘ to ifraad (in Hajj)?

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Check below answers in case you are looking for other related questions:
He did ‘umrah on behalf of his grandfather but did not complete sa‘i, then he went back to his city and got married. What should he do?
He masturbated whilst in ihraam

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Related Answers:
If a woman who is doing ‘Umrah gets her period, she should wait until she becomes pure
He is going to form the intention to do a second ‘umrah when he is in Jeddah; where should he enter ihram from?
Is it permissible to donate the reward of tawaaf to another person?
He did ‘umrah on behalf of his grandfather but did not complete sa‘i, then he went back to his city and got married. What should he do?
He masturbated whilst in ihraam

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